gitignore: Ignore *~

They seem to be generated by newer versions of autofoo.

Change-Id: Ia4514da3c3dcbc383487a3d98b322a5ecb918568
diff --git a/.gitignore b/.gitignore
index a9dd303..f5e794a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,6 +29,7 @@
 stamp-h1
 libtool
 libosmocore-*.tar.*
+*~
 
 # libtool for different platforms like arm-poky-linux-gnueabi-libtool
 *-libtool